Image Credit: Getty Images Robert Carradine, best known in recent years for playing Lizzie's dad, Sam McGuire, on Lizzie McGuire, died on February 23, 2026, at the age of 71. As fans and his former co-stars mourn Robert's death, many wondered what caused it since he had no known health issues. Hilary Duff, who played Robert's on-screen daughter in Lizzie McGuire, wrote a heartfelt Instagram tribute, noting that his death "hurts" her. "It's really hard to face this reality about an old friend," the "Mature" artist wrote.